We know where it broke, but we can’t see why. Was it a race condition? Did a database read return stale data that has since been overwritten? To find the cause, we have to mentally reconstruct the state of the world as it existed milliseconds before the crash. Welcome to debugging hell.
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，这一点在服务器推荐中也有详细论述
drop-oldest: Drops the oldest buffered data to make room. Useful for live feeds where stale data loses value.
as a result of the careful bookkeeping that typifies banks. But, well, that